I would never run 70A (or almost any power) through a compression connection
that includes a plastic material. The material will relax and you will end
up with contact resistance -- heat -- fire. Or something like that. Use
solder in stead.
Have fun, safety first.
Ahne.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dharma Kemp-Bresett
Sent: Wednesday, 24 January, 2007 11:24
To: [log in to unmask]
Subject: [TN] maximum recommended compression force
Hi All,
I received a call from one of my customers today on a subject I do not have
the answer for. I also do not have access to any of the IPC standards that
would have the answer to this question, as I am part of a design services
bureau and not a fabricator or assembler. I was hoping that one of the more
knowledgeable (than I) members on this forum would be able to give me some
sort of guidelines, even just a general one, if possible.
The question is as follows:
"I'm trying to find out what the maximum recommended compression force would
be for bolting a circuit board to a metal bar, for the purpose of making a
70 amp electrical connection. My concern is not damaging the board (an 8
layer board, in this case), and not causing the TG170 FR4 material to flow
out from underneath the bolt and washer. I realize that the answer may
depend on the total thickness of FR4 material and the total thickness of
copper in the stackup....."
I have already done some poking around in the archives but have not come
across the answer, as of yet. Therefore, I defer to the expansive knowledge
of those on this forum......
Thanks in advance,
Dharma
KAW/USA Ltd.
39 Simon Street, #4
Nashua, NH 03060
603-886-8711 x212
603-881-8763 fax
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